Where downspouts are not connected to a storm sewer, an elbow with an extension or a splash block is used to direct the water away from the foundation wall and to avoid erosion. The final grading of the lot should ensure positive drainage away from the building. SUSTAINABLE HOUSING INSIGHT Healthy Indoor Environment Eavestroughs and downspouts should collect rainwater and direct it away from the foundation walls, which will help to keep the basement dry. Environmental Responsibility Connect downspouts to a storage container such as a rain barrel or cistern, and use this water for watering lawns.